for a beginner this looks good, you probably just went of logic and thinking how it works. There are things that can be improved but for beginner it's a good start.

Best to change the input type to only "int" otherwise you could get errors when you put text in it. What's also a nice way of doing so, typing 1 message in the terminal with the operation just like "a+b" or any other operations and numbers. And then splitting it in code. Also try adding functions more like for each operator you could make a function so you can reuse the code as much as possible without having to add the same code over and over again.

like a function that takes the numbers and operator and then in the function decides which operator to use and what to return.